6种生物源农药对板栗栗实蛾和小蛀果斑螟的室内毒效和田间防效

Toxicity and Field Efficacy of Six Bio-pesticides against Larvae of Laspeyresia splendana and Assara exiguella

[目的]筛选对板栗栗实蛾和小蛀果斑螟高效低毒的生物源农药。[方法]用Potter喷雾法测定6种生物源农药对2种害虫的室内毒效,并通过田间试验评价其对2种害虫的防效。[结果]室内毒效测定结果表明,处理后48 h,0.3%印楝素乳油和2.5%鱼藤酮乳油处理组栗实蛾幼虫的校正死亡率分别为86.7%、83.3%,小蛀果斑螟的校正死亡率分别为93.3%、86.7%。田间试验结果表明,0.3%印楝素乳油和2.5%鱼藤酮乳油对栗实蛾和小蛀果斑螟的防效均在80%以上。其他4种药剂苏云金杆菌、皂烟液剂、烟碱液剂和茶皂素在室内和田间对2种害虫的防效均低于80%,防效较差。[结论]0.3%印楝素乳油和2.5%鱼藤酮乳油对栗实蛾和小蛀果斑螟具有较好的室内毒效和田间防治效果。

[ Objective] The aim was to screen out insecticides of high efficiency and low toxicity against the larve of Assara exiguella and Laspey-resia splendana. [Method] The indoor toxicity and field effect of six bio-pesticides against the two kinds of insects were studied through indoor toxicity by Potter-spraying method and field trial, respectively. [Result] The indoor toxicity result showed that the corrected mortalities of 0.3% azadirachtin EC and 2.5% rotenone EC against Laspeyresia splendana after 48 hours of treatment were 86. 7% and 83. 3% , respectively, and which against Assara exiguella were 93. 3% and 8 6 .7% Respectively. The field test result showed that the control efficacy of 0. 3% azadirachtin EC and 2.5% rotenone EC against Laspeyresia splendana and Assara exiguella were all over 80% ,and which of 30% nicotine water, 10% yanjian water and 28% chazaosu aqua were less than 80% . [ Conclusion] 0. 3% azadirachtin EC and 2. 5% rotenone EC have better effect on Laspeyresia splendana and Assara exiguella.